Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A302076

Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =10a(2) =33a(3) =115a(4) =386a(5) =1323a(6) =4485a(7) =15290a(8) =51977a(9) =176947a(10) =601946a(11) =2048483a(12) =6969893a(13) =23717058a(14) =80700241a(15) =274599219a(16) =934369138a(17) =3179364635a(18) =10818345477a(19) =36811374474a(20) =125257251353a(21) =426210254579

External references